erosion and deposition. runoff and erosion precipitation over the united states averages about...
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WATER EROSIONEROSION AND DEPOSITION
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Runoff and Erosion Precipitation over the United States averages
about 75 cm per year. About 22.5 cm becomes runoff. Generally, more runoff means more erosion.
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Runoff and Erosion Water flowing across the land runs
together to form rills, gullies, and streams.
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Erosion by Rivers A waterfall forms where a flat layer of tough rock lies
over a layer of softer rock that erodes easily. When the softer rock erodes, pieces of the harder rock above break off, creating the waterfall’s sharp drop.
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Erosion by Rivers Erosion often forms meanders and oxbow
lakes where a river winds across its floodplain.
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Deposits by Rivers Deposition creates landforms such as alluvial
fans and deltas.
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Alluvial Fan
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The Course of a River The slope and size of
a river, as well as the sediment it carries, determine how a river shapes the land.
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Groundwater Erosion Karst topography is found in many parts of the
United States where the bedrock is made up of thick layers of limestone.
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Groundwater Erosion Chemical weathering of limestone and
groundwater erosion can create a limestone cave.